package com.sky.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.util.Arrays;
import java.util.List;

@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Resource
    private SetmealMapper setmealMapper;

    @Resource
    private SetMealDishMapper setMealDishMapper;

    @Resource
    private DishMapper dishMapper;

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }

    /**
     * 新增套餐
     * @param setmealDTO
     */
    @Override
    @Transactional
    public void save(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);
        //向套餐表插入数据
        setmealMapper.insert(setmeal);
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        for (SetmealDish setmealDish : setmealDishes) {
            setmealDish.setSetmealId(setmeal.getId());
        }
        //保存套餐和菜品的关联关系
        setMealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 分页查询
     * @param setmealPageQueryDTO
     * @return
     */
    @Override
    public PageResult page(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(),setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.page(setmealPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());

    }

    /**
     * 批量删除套餐和套餐对应的菜品
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatchById(List<Long> ids) {
            //判断不能删除的情况，1、正在起售的不能删除
        for (Long id : ids) {
            Setmeal setmeal = setmealMapper.selectById(id);
            if (setmeal.getStatus()== StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        }
        //删除套餐
        setmealMapper.deleteBatchById(ids);
        //删除套餐对应的菜品
        setMealDishMapper.deleteBatchById(ids);
    }

    /**
     * 根据id回显数据
     * @param id
     * @return
     */
    @Override
    public SetmealVO getById(Long id) {
        SetmealVO setmealVO = setmealMapper.selectByIdWithDish(id);
        return setmealVO;
    }

    /**
     * 修改套餐
     * @param setmealDTO
     */
    @Transactional
    @Override
    public void update(SetmealDTO setmealDTO) {
        //对于套餐表可以直接修改，因为id是一对一的关系
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);
        setmealMapper.updateById(setmeal);
        //对于菜品表，一个套餐有多个菜品，不好修改菜品的数据，所以采用先删后增
       setMealDishMapper.deleteBatchById(Arrays.asList(setmealDTO.getId()));
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        for (SetmealDish setmealDish : setmealDishes) {
            setmealDish.setSetmealId(setmeal.getId());
        }
        setMealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 启动或停止套餐
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
    //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        //过关斩将
        if(status == StatusConstant.ENABLE){
            List<Dish> dishes = dishMapper.getBySetmealId(id);
            if (!dishes.isEmpty()){
                for (Dish dish : dishes) {
                    if (dish.getStatus()==StatusConstant.DISABLE){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                }
            }
        }
        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status).build();
        setmealMapper.updateById(setmeal);
    }
}
